A 38-year-old woman presented with a bilateral, chronic, progressive optic neuropathy following Jejunoileal bypass surgery for morbid obesity. Standardized A-scan orbital echography revealed grossly swollen optic nerve sheaths with a positive 30° test, indicating increased subarachnoid fluid. Review of reported complications of Jejunoileal bypass surgery revealed no similar case of what might be termed the “optic nerve ascites syndrome.”